Planer



May 19, 1931. F. H. HowLr-:TT 13505546 PLANER Filed Feb. 19, 1950 2 Sheets-sheet 1 N V EN TOR. A M .Mm

` A TTORNEYS.

Patented :May 19, 1931.( t

" UNITED .sfmriisvfPnTE yWoLFs'oHN, or

' v kSAN FRANCISCQ'CALIFORNIA y l PLANER Application aleja rebniaiyf 19, 1930.y sgriai'm. 429,631.

i rlhis invention pertains to Vplaners and especially to' a small portable type'of planer commonly used in the art of dentistry fork trimming plaster casts and the like, as is shown in niyco-pending application entitled Planer filed November 17, 1928, Serial'Njo; 320,199. y y It is the object of 'my present invention Vto generally improve theA construction-andoperation of such planersY by the provision anV planer head and. driving improved type of means therefor. y Y 4 I attain this obj ect through vthe combination with a base member and an adjustable work ytable supported thereby, of a 'pivotedplaner head carrying a planer blade and 'adapted to be oscillated about its pivot so that the blade willV come into contact with and impart a i shearing out Vto the work supported upon the table. Further "objects and advantages of ymy invention will become apparent Ethrough vIV--IV of Fig. l, and

an' understanding ofthe accompanying drawings and specications in which 'have Y shown and described a preferred embodiment Fig. 5 isa sectional view of the taken on the line V-.V of Fig. 4.

` Referring more particularly to the drawings and especially toFigs. l and 3, I show a base A upon which is supported a worktable Y Y B, a planer head C, a driving mechanism D, and a suitable source ofpower shown in the form oigan electric motor E.V YThe work table Bis made adjustable by means identical to thoseshown in my above 'named co-pending application. The table is pivotally secured at its forward end as-at 10 to lugs ll formed upon the base. TheV other end is supported so that the table assumes its normal horizontal position, by aV pivotal arm l2 and may be supported in any-desired angular position by means of a link 13 depending `formed "on eitherside of the planer head' are released. Y

from its underside and adaptedjtobe engaged by a clampingscrew 14.carried by a lug l5 extending upwardly `from the base. The tablefis' also' provided with an adjustable scribe 16 for tothe planer. f

' Theiyplaning mechanism consists of the yplaner headC secured to fa shaft 17'bymeans OFFICE .i

FRANK H. HOWLETT, or OAKLAND, CALIFORNIA; AssrG'NoR- ".ro nenn guiding 'thework :as it is fed4 of akeyfor pinias shown at a. r 'The shaft 17 A is j'ournalled "in a pair of bearing lugs 18 l'stormed uponthe base A.- It willbe seen that y oscillatory movement of thesha'ft fl Ywill im part' like movement to `the planer head 'secured to it, or in other words cause the planer head vto'nfiove 'up and down in 'it-ront of the table B. The side 'of the planer head adja-y centi'th'e 'table is'provided with a smooth sur-A face'orplanerface 19iand hasa slot20ffor1`ned therein 'through which a blade 21 extends.

Tiiebiade 21 isdisposed ,ab an angl@ t0 the planer .face`19fthroughV which it extends and issecuredtolthe back of Vthe planer head 'by means offbolts shown, at 22 in Figsi`4 and 5. Thesplaner yhead hasa pair of Viianges 23 blade 21, and a removableback cover 24 isheld against these kiiangesby meafns of two ordinaryscrews 25 engagingrthe slots 'in the lower edge of the cover 24 and thumb screws through holes in its upper edge. The flanges 23 and 'the 'back 24m-operate in forming a dustreceivingchamber adjacent the 'back of the blade2i. The covery forms a closure for ythetop andbackof this chamberandthe bot-y toinvend is left open,s`o that vdust or shavings thrown `into 'thechaniber from the blade will be' allowed'ftof vfall through an opening 26 formedin 'the .base A `into -a 'suitable drawer contained by thebasesuch as is shown aty 27.

A guard Q28 surrounds fthe opening 26 to prevent Ascatteringof "the dust asyitV falls" from the planer head intogthe drawer'27. f

purpose of cleanin'l'gthe dust receiving chamber, fit' is'y "merely "necessary yto unscrew the thumb screws25a 'and *lift thecover-up as the screws 25 pass through slots in the cover that are Iopen at the lower Eend and consequently permit its, removal when thel thumbv screws 25a passing 80 uppermost positions.

Oscillatory motion is imparted to the planer head in the following manner. rl`he motor E supported by the base member rotates a crank disk 30 through suitable reduction gearing incased in the housing shown at 31. A cranky pin 32 is mounted on the crank disk 31 and a round rod or lever 33 is secured at one end to the shaft 17, which carries the planer head. The other end of the lever 33 extends through a sleeve 34 which is pivotally mounted on the crank pin 32.

It will be understood from the description so far that the crank disk when rotating carries the sleeve 34 mounted on the crank pin with it. As the lever 33 extends through the sleeve it may be seen that it is caused to oscillate by the rotary motion of the crank disk. The lever and the planer head being both secured to the common shaft 17, it is apparent that the oscillation of the lever will also cause the planer head to oscillate.

Among the advantages of the driving mechanism shown is thek fact that it imparts a slow, powerful motion to the planer head on its downward or cutting stroke and causes it to rise quickly. This may be best illustrated by referring to Fig. 2 in which the crank 33 are shown in their The arrow in this'figure indicates the direction of rotation of the crank disk and shows that on its downward stroke the crank pin moves away from the shaft 17 causing the sleeve 34 to slide toward the outer end of the lever 33, while on the uppin 32 and the lever ward stroke the sleeve is caused to slide inwardly upon the lever. As it is true that lever action increases in proportion to the distance from the fulcrum at which the force is applied, it is apparent that the downward stroke of the planer head will be slower and more powerful than the upward stroke. This is particularlydesirable as it is on the down'- ward stroke that the blade performs it cutting operation while no work is being done on the upward stroke.

While I have shown a preferred embodiment of my invention, it Vshould be understood that various changes may be resorted to in the design and arrangement of its several' parts without departing from the spirit and scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a device of the character described a pivotall mounted planer head having a planer ace thereon and a blade extending through said face, driving means for causing said planer head to oscillate, said means varying the ratio of power transmitted to saidkr planer head during its oscillatory strokes.y

2. In a planer of the character described, a normally horizontally disposed work supporting table, a vertically oscillating planer head adjacent said table, a blade carried by said planer head and adapted to cut work supported by the table on the downward stroke of the planer head, driving means for said planer head, and a variable speed power transmission connecting said head and driving means whereby the ratio of power transmission will automatically become greater upon the downward stroke of the planer head and less on the upward stroke.

3. In a device of the character described, a planer head secured to a pivoted shaft, a lever also secured to said shaft, a rotatable crank disk having a crank pin thereon, and means connecting said crank pin and said lever whereby rotation of saidcrank disk will im-y part oscillatory motion to said lever and said planer head.

4. In a device of the character described, a planer head secured to a pivoted shaft, a lever also secured to said shaft, a rotatable crank disk having a crank pin thereon, a sleeve member journalled on said crank pin and slidablyy engaging said lever whereby rotation of said crank disk will impart oscillatory motion to said lever and said planer head, and means for rotating said crank disk.

5. In a device of the character described a planer head secured to a pivoted shaft, a lever also secured to said shaft, a rotatable crank disk disposed parallel to said shaft, a crank pin carried by the crank disk for rotating the crank disk and a' sleeve journalled on said crank pin and slidably enga ing Vsaid'lever whereby rotation of said cran at a constant speed will cause said lever, and consequently said planer head, to oscillate quickly in one direction and relatively slow in the opposite direction.

FRANK H. HOW'LET'I. 

